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Petrogenetic characterization of the host rocks of the Sanaga iron ore prospect,southern Cameroon

Acta Geochimica 2023年第2期42卷 195-220页

作者： Tasin Godlove Bafon Anthony Temidayo Bolarinwa Cheo Emmanuel Suh temesgen oljira Bekele Ayele Bedada Gilles Nyuyki Ngoran Kevin Ijunghi Ateh Boris Martial Keuko Djoumbissie Cho Terence Ngang Department of Geology Pan African University Life and Earth Science InstituteUniversity of IbadanIbadanNigeria Department of Geology Mining and Environmental ScienceUniversity of BamendaP.O.Box 39BambiliCameroon Explorers 33 Consulting Group Sarl P.O.Box 6666YaoundeCameroon Department of Earth Sciences Faculty of ScienceUniversity of Yaounde IP.O.Box 812YaoundeCameroon

The Sanaga iron ore prospect is a recent discovery in the Nyong Series with a resource estimated at 82.9 Mt at 32.1%Fe and whose origin remains *** mineralization occurs as NE-SW oriented discontinuous lenticular bodies of magnetite-bearing pyroxenegneisses(MPG)hosted by ortho-derived *** amphibolites are *** MPG mineral assemblage consists of quartz-magnetite-orthopyroxene-garnet-tremolite/actinolite exhibiting a granoblastic texture,which is characteristic of granulite facies *** granodioritic gneisses show compositional features of the tonalite-trondhjemite-granodiorite *** trace and REE element geochemistry indicate their protolith melt resulted from the partial melting of a subducted oceanic slab,with interaction with the overlying mantle wedge during *** amphibolites show enrichment in LILE with negative Ta–Nb and Zr–Hf indicating arc-related magmas generated by partial melting of a sub-continental lithospheric mantle source with metasomatism by subduction-related *** MPG exhibits oxidation-exsolution features characterized by ilmenite lamellae,with hematite fracture-fillinginmagnetite,andlacksfeatures characteristic of typical BIF such as LREE depletion relative to HREE,positive Eu,La,and Y *** on the results of this study,we interpret the Sanaga MPG as a possible skarn-type mineralization formed by the metamorphism/metasomatism of a possible BIF *** results of this study compare with similar magnetite-rich mineralization in the Sa o Francisco craton in northeastern Brazil and enhance the correlation of pre-drift reconstructions of the Sa o Francisco–Congo Cratons.

关键词： Magnetite-pyroxene-gneiss Metasomatism Ilmenite exsolution Hematite fracture-filling Skarn type mineralization Nyong Series

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Organic Geochemical Evaluation of Shale Units of Bokh Formation, Ogaden Basin, Ethiopia

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Open Journal of Geology 2020年第5期10卷 565-578页

作者： temesgen oljira Matthew E. Nton Oluwadayo O. Sonibare Pan African University Institute of Life and Earth Science (Including Health and Agriculture) University of Ibadan Ibadan Nigeria Department of Geology University of Ibadan Ibadan Nigeria Department of Chemistry University of Ibadan Ibadan Nigeria

Shale sample from Bokh Formation, Ogaden basin, Ethiopia was assessed for their petroleum potential by Rock-Eval pyrolysis. The Total Organic Carbon (TOC) values range from 0.76 to 0.86 wt%. These values exceed the minimum value of 0.5 wt% required for potential petroleum source rocks. The genetic potential (GP) and hydrogen index (HI) values range from 0.09 to 0.5 mg/g and 8 - 32 mgHC/gTOC, respectively. These values are generally lower than the minimal 2 mg/g GP and 200 mgHC/g HI required for a potential source rock. Several plots from the Rock-Eval pyrolysis data classify the samples as type IV kerogen with no potential to generate hydrocarbons. The Tmax and Production Index (PI) values range from 388°C to 453°C and 0.28 to 0.46, respectively. These values indicate that the shales are thermally matured. These results show that the shales from the Bokh Formation in Ogaden basin have no potential to generate hydrocarbons mainly crude oil, but are thermally matured and may generate natural gas.

关键词： Ogaden Basin Bokh Formation Shale Hydrocarbon Source Rock

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Containment of COVID-19 in Ethiopia and implications for tuberculosis care and research

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Infectious Diseases of Poverty 2020年第5期9卷 131-131页

作者： Hussen Mohammed Lemessa oljira Kedir Teji Roba Getnet Yimer Abebaw Fekadu Tsegahun Manyazewal Addis Ababa University College of Health SciencesCenter for Innovative Drug Development and Therapeutic Trials for Africa(CDT-Africa)P.O Box 9086Addis AbabaEthiopia Department of Public Health College of Medicine and Health SciencesDire Dawa UniversityDire DawaEthiopia 不详

Background:The coronavirus disease 2019(COVID-19)has emerged as a global health and economic security threat with staggering cumulative incidence *** the severity of projections,hospitals across the globe are creating additional critical care surge capacity and limiting patient routine access to care for other diseases like tuberculosis(TB).The outbreak fuels panic in sub-Saharan Africa where the healthcare system is fragile in withstanding the ***,we looked over the COVID-19 containment measures in Ethiopia in context from reliable sources and put forth recommendations that leverage the health system response to COVID-19 and *** text:Ethiopia shares a major proportion of the global burden of infectious diseases,while the patterns of COVID-19 are still at an earlier stage of the epidemiology *** Ethiopian government exerted tremendous efforts to curb the *** limited public gatherings,ordered school closures,directed high-risk civil servants to work from home,and closed *** suspended flights to 120 countries and restricted mass *** declared a five-month national state of emergency and granted a pardon for 20402 *** officially postponed parliamentary and presidential *** launched the‘PM Abiy-Jack Ma initiative’,which supports African countries with COVID-19 diagnostics and infection prevention and control *** expanded its COVID-19 testing capacity to 38 countrywide *** institutions are made available to provide clinical care and ***,the outbreak still has the potential for greater loss of life in Ethiopia if the community is unable to shape the regular behavioral and sociocultural norms that would facilitate the spread of the *** government needs to keep cautious that irregular migrants would fuel the disease.A robust testing capacity is needed to figure out the actual status of the *** pandemic has reduced TB care and research activities si

关键词： COVID-19 Coronavirus Public health Tuberculosis Containment Ethiopia

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